Stuff membership packets with "freebies." Contact local pizza parlors and fast food restaurants for discount coupons; collect pencils, key chains, and tablets from local banks, insurance agencies, and other businesses and then give them to members as they join.

I got this idea from a student organizer in another state. The other state calls this "ScareFest." It looks something like this:

The student association invites former members to return during the month of October to share their challenges and successes as first-year teachers. The event emphasizes sharing tips and advice, one of which is always, "ask for help among your peers."